Datasheet

LTC3122
17
3122fa
For more information www.linear.com/LTC3122
applicaTions inForMaTion
Figure 5. 1MHz, 5V to 12V, 800mA Boost Converter
Figure 6. Bode Plot for Example Converter
Transient Response with 400mA
to 800mA Load Step
Switching Waveforms with 800mA Load
3122 F05a
V
IN
SD
PWM/SYNC
RT
V
CC
V
OUT
CAP
FB
V
C
LTC3122
SGND PGND
R
C
210k
C
C
390pF
SW
L1
3.3µH
R2
113k
R1
1.02M
C
F
10pF
C
VCC
4.7µF
C1
100nF
C
OUT
22µF
V
OUT
12V
800mA
R
T
57.6k
V
IN
5V
C
IN
4.7µF
ONOFF
PWMBURST
200ns/DIV
3122 F05b
V
OUT
100mV/DIV
AC-COUPLED
SW
10V/DIV
INDUCTOR
CURRENT
1A/DIV
FREQUENCY (kHz)
0.01
GAIN (dB)
PHASE (deg)
170
150
110
70
50
130
90
30
10
–10
–30
180
140
100
60
20
–20
–60
–100
–140
–180
–220
100.1
3122 F06
10001 100
GAIN
PHASE
100µs/DIV
3122 F05c
V
OUT
500mV/DIV
AC-COUPLED
OUTPUT
CURRENT
500mA/DIV